updated readme
mg_upload: trigger callback when file is already closed
Environmental variables required for PHP cgi.

In few windows machines, the environment variables "ProgramFiles" is required to successfully execute PHP code especially socket functions.
Merge pull request #157 from Thileepan/master

Environment variable required for PHP cgi
removing warning about _CRT_SECURE_NO_WARNINGS if it is already defined

	modified:   mongoose.c
Merge pull request #159 from aerotech/master

_CRT_SECURE_NO_WARNINGS should not generate a warning if already defined
Merge branch 'master' of git://github.com/valenok/mongoose into develop